Revamp hmac_context_dtor()
Revamp hmac_context_dtor()

Make it NULL safe.

lrascao/otp,dgud/otp,potatosalad/otp,lrascao/otp,jj1bdx/otp,g-andrade/otp,isvilen/otp,RoadRunnr/otp,erlang/otp,kvakvs/otp,vinoski/otp,g-andrade/otp,kvakvs/otp,dumbbell/otp,bsmr-erlang/otp,getong/otp,bjorng/otp,jj1bdx/otp,kvakvs/otp,uabboli/otp,rlipscombe/otp,mikpe/otp,potatosalad/otp,jj1bdx/otp,emacsmirror/erlang,legoscia/otp,bjorng/otp,dgud/otp,electricimp/otp,aboroska/otp,isvilen/otp,dumbbell/otp,electricimp/otp,g-andrade/otp,vladdu/otp,vladdu/otp,rlipscombe/otp,isvilen/otp,vinoski/otp,mikpe/otp,mikpe/otp,vinoski/otp,lrascao/otp,legoscia/otp,uabboli/otp,bsmr-erlang/otp,erlang/otp,lrascao/otp,ferd/otp,legoscia/otp,dumbbell/otp,rlipscombe/otp,jj1bdx/otp,rlipscombe/otp,emacsmirror/erlang,ferd/otp,legoscia/otp,emacsmirror/erlang,dumbbell/otp,potatosalad/otp,dgud/otp,RoadRunnr/otp,emacsmirror/erlang,getong/otp,dumbbell/otp,kvakvs/otp,vladdu/otp,bjorng/otp,getong/otp,potatosalad/otp,bsmr-erlang/otp,getong/otp,uabboli/otp,dgud/otp,isvilen/otp,rlipscombe/otp,isvilen/otp,electricimp/otp,jj1bdx/otp,isvilen/otp,dgud/otp,jj1bdx/otp,electricimp/otp,getong/otp,potatosalad/otp,electricimp/otp,legoscia/otp,g-andrade/otp,vinoski/otp,erlang/otp,aboroska/otp,dgud/otp,uabboli/otp,mikpe/otp,isvilen/otp,electricimp/otp,emacsmirror/erlang,bsmr-erlang/otp,jj1bdx/otp,dgud/otp,bsmr-erlang/otp,vinoski/otp,RoadRunnr/otp,rlipscombe/otp,RoadRunnr/otp,ferd/otp,emacsmirror/erlang,isvilen/otp,emacsmirror/erlang,aboroska/otp,uabboli/otp,vladdu/otp,dumbbell/otp,aboroska/otp,bsmr-erlang/otp,aboroska/otp,bsmr-erlang/otp,bjorng/otp,erlang/otp,uabboli/otp,ferd/otp,legoscia/otp,vinoski/otp,ferd/otp,erlang/otp,dgud/otp,kvakvs/otp,emacsmirror/erlang,emacsmirror/erlang,mikpe/otp,dumbbell/otp,bjorng/otp,getong/otp,vinoski/otp,kvakvs/otp,rlipscombe/otp,lrascao/otp,mikpe/otp,ferd/otp,mikpe/otp,isvilen/otp,bsmr-erlang/otp,rlipscombe/otp,electricimp/otp,aboroska/otp,g-andrade/otp,getong/otp,isvilen/otp,vladdu/otp,uabboli/otp,bjorng/otp,electricimp/otp,bsmr-erlang/otp,g-andrade/otp,lrascao/otp,bjorng/otp,bjorng/otp,ferd/otp,ferd/otp,g-andrade/otp,kvakvs/otp,g-andrade/otp,rlipscombe/otp,erlang/otp,g-andrade/otp,potatosalad/otp,erlang/otp,getong/otp,mikpe/otp,dgud/otp,dgud/otp,lrascao/otp,getong/otp,mikpe/otp,kvakvs/otp,erlang/otp,RoadRunnr/otp,kvakvs/otp,dumbbell/otp,rlipscombe/otp,mikpe/otp,jj1bdx/otp,RoadRunnr/otp,lrascao/otp,RoadRunnr/otp,vinoski/otp,vladdu/otp,aboroska/otp,legoscia/otp,lrascao/otp,erlang/otp,potatosalad/otp,potatosalad/otp,uabboli/otp,RoadRunnr/otp,aboroska/otp,g-andrade/otp,legoscia/otp,jj1bdx/otp,emacsmirror/erlang,vinoski/otp,vladdu/otp,jj1bdx/otp,aboroska/otp,potatosalad/otp,bjorng/otp,RoadRunnr/otp,vinoski/otp,vladdu/otp,uabboli/otp,vladdu/otp,potatosalad/otp,electricimp/otp,legoscia/otp,erlang/otp,ferd/otp,dumbbell/otp,getong/otp,dumbbell/otp,bjorng/otp